Right you are.
Root: ح ج ب
Words from this Root in the Grand Qur’ān:
a) Total occurrences: 8
b) No of constructions: 5
Ibn Faris [died 1005] stated:
(مقاييس اللغة)
الحاء والجيم والباء أصل واحد، وهو المنع. يقال حجبته عن كذا، أي منَعتُه.
It signifies preventing and hindering and is used to describe a state when one is separated from another by something coming in between, a barrier.
Lane Lexicon: He, or it, prevented, hindered, debarred, or precluded, him, or it:
Classical Lexicons
It relates to Semantic frame Change_accessibilityA barrier, barricade, partitioning wall is meant for making some place inaccessible to visual noticing. It can also be such barrier that restricts the access of voice to the place behind/beyond the barrier, in Arabic:

a verbal noun denoting a state or act. The barrier may or may not be tangible, hidden or invisible (17:45 vacuum that hinders voice travel) that barricades/cordons off visual or vocal access to some object on its other side.
http://haqeeqat.pk/roots/(273).htm